Fmr. PM: Bulgarians can't stand it

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People power upends Bulgarian government

"We will perform our functions until the election of a new Cabinet and we will do everything possible to ensure continuity," Borisov said in the formal resignation letter read to parliament, according to the Bulgarian News Agency.

The government has done its best to respond to the protesters' demands, the news agency quoted Borisov as saying.

Borisov, who has been prime minister since 2009, earlier told lawmakers his GERB party would not be part of a caretaker government.

Bulgaria, a country of just over 7 million people, held its first free multiparty elections since the Second World War in 1990, according to the CIA World Factbook.